debug: x1:Array
(
    [0] => 15903
    [1] => 13008
    [2] => 16479
    [3] => 17026
    [4] => 17196
    [5] => 17205
    [6] => 17220
    [7] => 17229
    [8] => 17233
    [9] => 17238
    [10] => 16962
    [11] => 41605
    [12] => 41606
    [13] => 41608
    [14] => 41611
    [15] => 41612
    [16] => 41615
    [17] => 41616
    [18] => 41618
    [19] => 41620
    [20] => 41630
    [21] => 41632
)